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Community Member

BFD

I have two 6500 switches connected directed trough a fiber link.

I am using Ge-WAN ports, so and OSM module.

When I configure BFD with

bfd interval 50 min_rx 50 multiplier 3

Sometimes I have an down in bfd and 1ms after I have the up.

But If I configure

bfd interval 100 min_rx 100 multiplier 3

I don't have any bfd down event.

If I ping from one 6500 to another I have this

1/2/4ms latency.

Someone can help me?

6 REPLIES

Re: BFD

Hi,

the observed behaviour means you have 3 consecutive dropped/missing BFD packets within a 150 ms time window. There can be many reasons why this occurs - overloaded interface, failure in the SP network, etc.

In case you need not restrict outages to less than 300 ms I would just leave the second setting in place.

Regards, Martin

Community Member

Re: BFD

But my network is new. I don't have any traffic on it , and the switch cpu is 1%.

And If I ping from one switch to the other one I have a max 4ms...

Why I am missing more than 150ms!

Community Member

Re: BFD

please give an "show bfd neigh detail" from

your configuration.

Community Member

Re: BFD

TAC told me this is a BUG.

BUG CSCeg23062

Community Member

Re: BFD

what version of IOS u have ? i asked u this because in our live network we have also some problems with bfd.

Community Member

Re: BFD

I am using 12.2(18)SXE5

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